Observe the graph:

The graph of the function passes through the origin.

Hence the graph of the function is a sine function.

The general form of sine functon is $\"\"$ .

Amplitude of the graph is $\"\"$ .

The graph of the function starts at $\"\"$ and completes one cycle at $\"\"$ .

Period is $\"\"$ .

$\"\"$

$\"\"$ .

Substitute values of $\"\"$ and $\"\"$ in $\"\"$ .

$\"\"$ .

The function of the graph is $\"\"$ .